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I am new to IntelliJ and gradle and I want to debug my Spring boot application remotely , request is coming from UI and I need to debug the request , But not getting success , tried many thing followed JetBrain site and also tried to configure the debug setup.

but I m really getting frustrated, I guess I am not starting server in debug mode or doing something wrong.

Could anyone tell me how to set up the configuration in IntelliJ with Gradle Spring project?

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getting error like: Unable to open debugger port (localhost:8082): java.io.IOException "handshake failed - connection prematurally closed"

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Edit: do I need to do anything else , my app is running on 8082 port no. I am running my app normally as I do via cmd line ./gradlew bootRun

Vinay Vishwkarma
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    You need to set some JVM flags to enable debugging on the Java process. This should allow you to attach IntelliJ using the _Remote_ run configuration. Please review the following post: https://stackoverflow.com/questions/21114066/attach-intellij-idea-debugger-to-a-running-java-process – Gregor Zurowski Oct 01 '21 at 08:11
  • Please see if https://www.jetbrains.com/help/idea/tutorial-remote-debug.html help. – Egor Klepikov Oct 01 '21 at 08:46
  • Yes i have tried the same but getting error like "Unable to open debugger port (localhost:8082): java.io.IOException "handshake failed - connection prematurally closed"" – Vinay Vishwkarma Oct 01 '21 at 10:05
  • What Java version do you use? Try launching with JDK 8. Here is a related issue https://youtrack.jetbrains.com/issue/IDEA-173607 . – Egor Klepikov Oct 01 '21 at 10:17

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Unless you made some modifications to the Gradle build configuration (which I doubt being the case since you mentioned being new to Gradle), you should be able to start you application with a debugger attached to it using the --debug-jvm flag:

$ ./gradlew run --debug-jvm

and since you are using Spring Boot, you should rather use the bootRun task:

$ ./gradlew bootRun --debug-jvm

Once above command fired, your application will start and you should see below line in output:

Listening for transport dt_socket at address: 5005

stating that the JVM debugger is waiting for a client to attach on port 5005 which should be the same as your IntelliJ IDEA | Remote JVM Debug configuration port. Change the port from 8082 to 5005 for your Store_Debug configuration then click on the icon and you should see a message stating that your debugger is attached:

Connected to the target VM, address: 'localhost:5005', transport: 'socket'
tmarwen
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